第 19 章 使用设备插件

借助设备插件，您无需编写自定义代码，就能在 OpenShift Container Platform pod 中使用特定的设备类型，如 GPU、InfiniBand 或其他需要供应商专用初始化和设置的类似计算资源。设备插件提供一致并可移植的解决方案，以便跨集群消耗硬件设备。设备插件通过一种扩展机制为这些设备提供支持，从而使这些设备可供容器使用，提供这些设备的健康检查，并安全地共享它们。

设备插件是在节点( atomic-openshift-node.service)上运行的 gRPC 服务，负责管理特定的硬件资源。任何设备插件都必须支持以下远程过程调用 (RPC)：

service DevicePlugin {
      // GetDevicePluginOptions returns options to be communicated with Device
      // Manager
      rpc GetDevicePluginOptions(Empty) returns (DevicePluginOptions) {}

      // ListAndWatch returns a stream of List of Devices
      // Whenever a Device state change or a Device disappears, ListAndWatch
      // returns the new list
      rpc ListAndWatch(Empty) returns (stream ListAndWatchResponse) {}

      // Allocate is called during container creation so that the Device
      // Plug-in can run device specific operations and instruct Kubelet
      // of the steps to make the Device available in the container
      rpc Allocate(AllocateRequest) returns (AllocateResponse) {}

      // PreStartContainer is called, if indicated by Device Plug-in during
      // registration phase, before each container start. Device plug-in
      // can run device specific operations such as reseting the device
      // before making devices available to the container
      rpc PreStartContainer(PreStartContainerRequest) returns (PreStartContainerResponse) {}
}